"Lift return out" produces invalid code for "else if"

[lancelote]

Environment

• IntelliJ Rust plugin version: 0.2.114.SNAPSHOT-193-dev
• Rust toolchain version: 1.41.0-nightly (99b89533d 2019-12-16) x86_64-apple-darwin
• IDE name and version: CLion 2019.3 (CL-193.5233.103)
• Operating system: macOS 10.15

Problem description

"Lift return out of 'if'" intention action (from #4172) may produce an invalid code in case of else if construction.

Steps to reproduce

Consider

fn get_char(n: u32) -> char {
    if n == 0 {
        return 'a'
    } else if n == 1 {
        return 'b'
    } else {
        return 'c'
    }
}

Plugin suggests to lift out return from the second if resulting in

fn get_char(n: u32) -> char {
    if n == 0 {
        return 'a'
    } else return if n == 1 {
        'b'
    } else {
        'c'
    }
}